In a world where everyone is downsizing, including car manufacturers making their engines smaller, GM has gone the opposite way. It’s gone on to upgrade the new 2027 Chevrolet Silverado 1500 and GMC Sierra 1500 with 5.7-liter and 6.6-liter naturally aspirated small-blocks, replacing the 5.3-liter and the 6.2-liter V8s, respectively.